package com.mask.token.service;

import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.scheduling.annotation.Async;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.stereotype.Service;

import java.time.Instant;
import java.util.List;
import java.util.concurrent.CompletableFuture;

/**
 * Token异步处理服务
 * 提供异步Token操作，提升性能
 *
 * @author mask
 * @since 1.0.0
 */
@Slf4j
@Service
@RequiredArgsConstructor
@EnableAsync
@ConditionalOnProperty(name = "mask.token.async.enabled", havingValue = "true", matchIfMissing = false)
public class MaskTokenAsyncService {

    private final MaskTokenService tokenService;
    private final MaskTokenRedisService redisService;

    /**
     * 异步生成Token
     */
    @Async("tokenTaskExecutor")
    public CompletableFuture<String> generateTokenAsync(com.mask.token.model.MaskUserDetails userDetails) {
        try {
            log.debug("异步生成Token开始: {}", userDetails.getUsername());
            String token = tokenService.generateAccessToken(userDetails);
            log.debug("异步生成Token完成: {}", userDetails.getUsername());
            return CompletableFuture.completedFuture(token);
        } catch (Exception e) {
            log.error("异步生成Token失败", e);
            CompletableFuture<String> future = new CompletableFuture<>();
            future.completeExceptionally(e);
            return future;
        }
    }

    /**
     * 异步验证Token
     */
    @Async("tokenTaskExecutor")
    public CompletableFuture<Boolean> validateTokenAsync(String token) {
        try {
            log.debug("异步验证Token开始: {}", token);
            boolean isValid = tokenService.validateToken(token);
            log.debug("异步验证Token完成: {}, 结果: {}", token, isValid);
            return CompletableFuture.completedFuture(isValid);
        } catch (Exception e) {
            log.error("异步验证Token失败", e);
            CompletableFuture<Boolean> future = new CompletableFuture<>();
            future.completeExceptionally(e);
            return future;
        }
    }

    /**
     * 异步刷新Token
     */
    @Async("tokenTaskExecutor")
    public CompletableFuture<String> refreshTokenAsync(String token, com.mask.token.model.MaskUserDetails userDetails) {
        try {
            log.debug("异步刷新Token开始: {}", token);
            String newToken = tokenService.refreshToken(token, userDetails);
            log.debug("异步刷新Token完成: {}", token);
            return CompletableFuture.completedFuture(newToken);
        } catch (Exception e) {
            log.error("异步刷新Token失败", e);
            CompletableFuture<String> future = new CompletableFuture<>();
            future.completeExceptionally(e);
            return future;
        }
    }

    /**
     * 异步注销Token
     */
    @Async("tokenTaskExecutor")
    public CompletableFuture<Void> logoutAsync(String token) {
        try {
            log.debug("异步注销Token开始: {}", token);
            tokenService.logout(token);
            log.debug("异步注销Token完成: {}", token);
            return CompletableFuture.completedFuture(null);
        } catch (Exception e) {
            log.error("异步注销Token失败", e);
            CompletableFuture<Void> future = new CompletableFuture<>();
            future.completeExceptionally(e);
            return future;
        }
    }

    /**
     * 异步批量注销用户所有Token
     */
    @Async("tokenTaskExecutor")
    public CompletableFuture<Void> logoutAllAsync(Long userId) {
        try {
            log.debug("异步批量注销用户Token开始: {}", userId);
            tokenService.logoutAll(userId);
            log.debug("异步批量注销用户Token完成: {}", userId);
            return CompletableFuture.completedFuture(null);
        } catch (Exception e) {
            log.error("异步批量注销用户Token失败", e);
            CompletableFuture<Void> future = new CompletableFuture<>();
            future.completeExceptionally(e);
            return future;
        }
    }

    /**
     * 异步清理过期Token
     */
    @Async("tokenTaskExecutor")
    public CompletableFuture<Integer> cleanExpiredTokensAsync() {
        try {
            log.debug("异步清理过期Token开始");
            tokenService.cleanExpiredTokens();
            log.debug("异步清理过期Token完成");
            return CompletableFuture.completedFuture(0);
        } catch (Exception e) {
            log.error("异步清理过期Token失败", e);
            CompletableFuture<Integer> future = new CompletableFuture<>();
            future.completeExceptionally(e);
            return future;
        }
    }

    /**
     * 异步获取用户Token统计
     */
    @Async("tokenTaskExecutor")
    public CompletableFuture<MaskTokenLoginStrategy.LoginStatistics> getUserLoginStatisticsAsync(Long userId) {
        try {
            log.debug("异步获取用户登录统计开始: {}", userId);
            // 这里需要实现获取用户登录统计的逻辑
            MaskTokenLoginStrategy.LoginStatistics statistics = new MaskTokenLoginStrategy.LoginStatistics();
            statistics.setUserId(userId);
            statistics.setTotalDevices(0);
            statistics.setActiveDevices(0);
            statistics.setLastLoginTime(Instant.now());
            
            log.debug("异步获取用户登录统计完成: {}", userId);
            return CompletableFuture.completedFuture(statistics);
        } catch (Exception e) {
            log.error("异步获取用户登录统计失败", e);
            CompletableFuture<MaskTokenLoginStrategy.LoginStatistics> future = new CompletableFuture<>();
            future.completeExceptionally(e);
            return future;
        }
    }

    /**
     * 异步批量操作
     */
    @Async("tokenTaskExecutor")
    public CompletableFuture<BatchOperationResult> batchOperationAsync(List<String> tokens, BatchOperationType operationType) {
        try {
            log.debug("异步批量操作开始: {}, 操作类型: {}", tokens.size(), operationType);
            
            BatchOperationResult result = new BatchOperationResult();
            result.setTotalCount(tokens.size());
            result.setSuccessCount(0);
            result.setFailureCount(0);
            
            for (String token : tokens) {
                try {
                    switch (operationType) {
                        case VALIDATE:
                            if (tokenService.validateToken(token)) {
                                result.setSuccessCount(result.getSuccessCount() + 1);
                            } else {
                                result.setFailureCount(result.getFailureCount() + 1);
                            }
                            break;
                        case LOGOUT:
                            tokenService.logout(token);
                            result.setSuccessCount(result.getSuccessCount() + 1);
                            break;
                        case REFRESH:
                            // 这里需要实现刷新逻辑
                            result.setSuccessCount(result.getSuccessCount() + 1);
                            break;
                    }
                } catch (Exception e) {
                    result.setFailureCount(result.getFailureCount() + 1);
                    log.warn("批量操作中单个Token处理失败: {}", token, e);
                }
            }
            
            log.debug("异步批量操作完成: 成功={}, 失败={}", result.getSuccessCount(), result.getFailureCount());
            return CompletableFuture.completedFuture(result);
        } catch (Exception e) {
            log.error("异步批量操作失败", e);
            CompletableFuture<BatchOperationResult> future = new CompletableFuture<>();
            future.completeExceptionally(e);
            return future;
        }
    }

    /**
     * 批量操作类型
     */
    public enum BatchOperationType {
        VALIDATE, LOGOUT, REFRESH
    }

    /**
     * 批量操作结果
     */
    public static class BatchOperationResult {
        private int totalCount;
        private int successCount;
        private int failureCount;
        private Instant timestamp;

        public BatchOperationResult() {
            this.timestamp = Instant.now();
        }

        // Getters and Setters
        public int getTotalCount() { return totalCount; }
        public void setTotalCount(int totalCount) { this.totalCount = totalCount; }
        public int getSuccessCount() { return successCount; }
        public void setSuccessCount(int successCount) { this.successCount = successCount; }
        public int getFailureCount() { return failureCount; }
        public void setFailureCount(int failureCount) { this.failureCount = failureCount; }
        public Instant getTimestamp() { return timestamp; }
        public void setTimestamp(Instant timestamp) { this.timestamp = timestamp; }
    }
}
